64918518751 has 4 divisors (see below), whose sum is σ = 65647940400. Its totient is φ = 64189097104.

The previous prime is 64918518733. The next prime is 64918518761. The reversal of 64918518751 is 15781581946.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 64918518751 - 2³⁵ = 30558780383 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 64918518692 and 64918518701.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64918518701) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 364710691 + ... + 364710868.

It is an arithmetic number, because the mean of its divisors is an integer number (16411985100).

Almost surely, 2^64918518751 is an apocalyptic number.

64918518751 is a deficient number, since it is larger than the sum of its proper divisors (729421649).

64918518751 is an equidigital number, since it uses as much as digits as its factorization.

64918518751 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 729421648.

The product of its digits is 2419200, while the sum is 55.

The spelling of 64918518751 in words is "sixty-four billion, nine hundred eighteen million, five hundred eighteen thousand, seven hundred fifty-one".